$scrollbar-background-color: rgba(#909399, 0.3) !default;
$scrollbar-hover-background-color: rgba(#909399, 0.5) !default;
.scrollbar {
  overflow: hidden;
  position: relative;
  &:active,
  &:focus,
  &:hover {
    > .scrollbar__bar {
      opacity: 1;
      transition: opacity 340ms ease-out;
    }
  }
  &__wrap {
    overflow: scroll;
    height: 100%;
    &--hidden-default {
      scrollbar-width: none;
      &::-webkit-scrollbar {
        width: 0;
        height: 0;
      }
    }
  }
  &__thumb {
    position: relative;
    display: block;
    width: 0;
    height: 0;
    cursor: pointer;
    border-radius: inherit;
    background-color: $scrollbar-background-color;
    transition: 0.3s background-color;
    &:hover {
      background-color: $scrollbar-hover-background-color;
    }
  }
  &__bar {
    position: absolute;
    right: 2px;
    bottom: 2px;
    z-index: 1;
    border-radius: 4px;
    opacity: 0;
    transition: opacity 120ms ease-out;
    &.is-vertical {
      width: 6px;
      top: 2px;
      > div {
        width: 100%;
      }
    }
    &.is-horizontal {
      height: 6px;
      left: 2px;
      > div {
        height: 100%;
      }
    }
  }
}
